# Update the column for the new value type in table ''cdfvalue'' e.g. column ''numbervalue''.
# Update the column ''value_type'' to the new type and delete the value from the old column.
# Update the column ''fieldtype'' and ''display_mechanism'' in table ''field'', see image below for valid combinations.
# Update the column ''cdf_datatype'' in table ''customdefinedfield''.
# Depending on what change is done; insert or delete values from table ''allowed_value_set''.